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This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (June 2016) (Learn how and when to remove this template message)
- http://dict.die.net/rock%20butter/—has information from Webster's Revised Unabridged Dictionary (1913)
- Rock Butter, from the U.S. Bureau of Mines' Dictionary of Mining, Mineral, and Related Terms (1996), online at the Hacettepe University Department of Mining Engineering website.
- This article incorporates text from a publication now in the public domain: Wood, James, ed. (1907). "article name needed". The Nuttall Encyclopædia. London and New York: Frederick Warne.
- This article incorporates text from a publication now in the public domain: Porter, Noah, ed. (1913). "Webster's entry needed". Webster's Dictionary. Springfield, Massachusetts: C. & G. Merriam Co.
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